A significant percentage of pre-embryos fail to continue their development or to implant in the uterus. Explain what may happen to prevent development from continuing
What will be an ideal response?
Causes may include major chromosomal abnormalities in the zygote or an inhospitable uterine environment. Examples might be the presence of an IUD or low levels of estrogen and progesterone.
You might also like to view...
According to the first law of thermodynamics,
A) chemical reactions are exothermic. B) entropy tends to increase. C) potential energy tends to degrade into an unavailable form. D) energy is neither created nor destroyed.
Which sentence best describes the difference between plant cell division and animal cell division?
a. In animal cells, but not plant cells, cytokinesis is accomplished by formation of a cleavage furrow. b. In animal cells, replication of chromosomes occurs during interphase, while in plant cells replication occurs when the nuclear envelope disintegrates. c. In plant cells, centrosomes have an important role in spindle formation, while in animal cells centrosomes do not function during cell division. d. In plant cells, but not animal cells, cytokinesis is accomplished by formation of a cleavage furrow.
The membranes that protect the brain and spinal cord are called
a) gray matter. b) cerebrospinal membranes. c) epithelium. d) meninges. e) ventricles.
If one particular gene has a dramatically different ________ from others within an organism's genome, it is likely that the gene was acquired via horizontal gene transfer
a. AT content b. GC content c. codon bias d. All of the above are correct.